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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2012-06-23 15:19:31 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2012-06-23 15:19:31 +0000 |
| commit | 53ffe55a66efaf391c6911b9ed72d4dab542df64 (patch) | |
| tree | 7fc579428b09665def50281a4b429b435c22232b /llvm/lib/Target | |
| parent | 78ade1dd0896c48bc6865f73aa0284cbf82e99f0 (diff) | |
| download | bcm5719-llvm-53ffe55a66efaf391c6911b9ed72d4dab542df64.tar.gz bcm5719-llvm-53ffe55a66efaf391c6911b9ed72d4dab542df64.zip | |
Add a microoptimization note.
llvm-svn: 159082
Diffstat (limited to 'llvm/lib/Target')
| -rw-r--r-- | llvm/lib/Target/README.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/Target/README.txt b/llvm/lib/Target/README.txt index 093255e6af2..cbfa4cf35ba 100644 --- a/llvm/lib/Target/README.txt +++ b/llvm/lib/Target/README.txt @@ -964,6 +964,12 @@ optimized with "clang -emit-llvm-bc | opt -std-compile-opts". //===---------------------------------------------------------------------===// +unsigned f(unsigned x) { return ((x & 7) + 1) & 15; } +The & 15 part should be optimized away, it doesn't change the result. Currently +not optimized with "clang -emit-llvm-bc | opt -std-compile-opts". + +//===---------------------------------------------------------------------===// + This was noticed in the entryblock for grokdeclarator in 403.gcc: %tmp = icmp eq i32 %decl_context, 4 |
